Adolph baeyer



disappeared.

is filtered, washed with water, and then re NiTED *ra'res PATENT OFFICE.

ANILIN AND SODA FABRIK,

OF MANNHE TM, GE RMANY.

PREPARATION OF NEW MATERIAL FOR THE MANUFACTURE OF ARTIFICIAL INDIGO.

SPECIFICATION forming part of Letters PatentNo. 251,671, dated December 2'7, 1881.

Application filed September 29,1881. ispecimene.)

To all whom it may concern Be it known that I, ADoLrn BAEYER, a subject of the King of Bavaria, residing at Munich, in the Kingdom of Bavaria and Einpire of Germany, have invented new and useful Improvements in the Preparation of a New Material for the Manufacture of Artificial in digo, of which the following is a specification.

This invention relates to the production of orthodinitrodiacetcnylphenyl, a substance intended for the manufacture of an artificial indigo-blue.

As an example of the manner in which my invention may be carried into effect I proceed as follows: I mix one part, by weight, of orthonitrophenglpropiolic acid with about one hundred parts of water. I then submit the said mixture to a distillation with steam, whereby the said orthonitrophenylpropiolic acid gets decomposed into carbonic acid and into orthonibroacetenyl benzinc. Orthonilroacetenyl henzine mixed in an alcoholic solution with an ammoniacal solution of cuprous chloride is changed into acharacteristic copper compound possessing a bright red color. Ten parts, by weight, of this copper compound of orthonitroacetenyi benzine are mixed with a solution containing twenty-five parts, by weight, of red prnssiate of potash and from six to seven parts, by weight, of caustic potash, dissolved in one hundred parts of water. I then allow the said mixture to stand during one or two days, or until the red color of the copper compound has The precipitate thus obtained peatediy extracted with alcohol in order toreino'ro any unchanged orthonitroacetcnyl benzine. It is then dried and digested with chloroform with application of heat. The solution thusobtained is submitted to distillatiomwhen,

after the evaporation of the solvent, dinitrodiaceteuydphenyl will be obtained in a solid crystalline condition.

Some characteristic properties of d-initrodiacetcuylphenyl thus produced, as above described, are as follows: It is a yellow crystalline solid, fusible at 212 centigrade, insoluble in water, cold alc0hol,.and other, sparingly soluble in hot alcohol, bisulphide of carbon, acetone, and benzine, easily soluble in hot nitro-benzine. It is ditticultly soluble in concentrated sulphuric acid, but dissolves readily upon the addition ot' fuming sulphuric acid with an intensely red color and with the production of diisatogcn-'a new substance, which forms the subjectanatterol' another application for Letters Patent.

I do not claim as my invention the production of diacetcnylpheuyl by shaking thecopper compound of acetenyl benzinc with alcoholic ammonia.

What. I claim as new, by Letters Patent, is-

As a new articlcot' manufacture, the orthodiuitrodiacetenylphcnyl hereinbeforc described, and having the characteristics above stated.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

and desire to secure ADOLPH BAEYER. Witnesses PAUL FRIEDLAENDER, LUDVIG Lounsnnuo. 

